Type-writing machine.



P. I. MAIN.

TYPE WRITING MACHINE. 122111011 1011 211.211 r1113. 25, 1911.

Patented Mar. 11,1913..

2 SHEETS-SHEET 1.

[rm/anion- 65 1; g%

F. F. MAIN.

- TYPE WRITING MACHINE.

APPLICATION FILED 1'33. 25, 1911.

1,055,480. I Patented Mar. 11,1913.

2 SHEETS-SHEET 2.

barren s ra rns PATENT orricn.

FRED IE. MAIN, OF CHICAGO, ILLINOIS, ASSIGNOR TO JOHN T. UNDERWOOD, F

BROOKLYN, NEW YORK.

TYPE-WRITING MACHINE.

Application filed February 25, 1911. Serial-No. 610,716.

I '0 all whom it. may concern:

Be it known that I, FRED F. MAIN, a citizen of the United States,residing in Chicage, in the county of Cook and State of Illinois, haveinvented certain newand useful Improvements in Type-Writing Machines, ofwhich the following is a specification. V

This invention relates to means for returning the carriage of atypewriting machine, to begin a new line of writing.

The object of the invention is to provide simple and efficient means forthis purpose, and for automatically line-spacing the paper. 7

I connect to the carriage the piston of a pneumatic cylinder, and Iprovide a fingerpiece or key for opening the valve to admit air tosaid'cylinder and to operate the piston and return the carriage; the airpressure being continued as long as said key remains depressed. Animproved connection is made between the piston rod and the line-spacingmechanism of the typewriter for turning the platen when the carriage isrun back.

In the accompanying drawings, Figure 1 is a side elevation of anUnderwood front strike writing machine provided with the presentimprovements Fig. 2 is a sectional view of a three-way valve connectedto the pneumatic cylinder, and showing the valve closed againstadmission of compressed air. Fig. 3 is a similar view showing the valveopen. F i 4 is a perspective view showing the front eft hand corner ofthe paper carriage and a part of the automatic platen rotating means.Fig. 5 is a rear View of the machine, and Fig. 6is an elevationillustrating the method of operating the linespacing lever.

As usual in said machine, key levers I operate bell cranks 2 to throwtype bars 3 up to strike a platen 4, which is mounted on a carriage 5.This carriage is driven by I a spring-barrel 6, and controlled byescapeboard and extends'upwardly from a rock shaft 10, which extendshorizontally back, and at its rear end is provided with an up- .ratchetsecured to the platen 4.

depression of said key 9 therefore, the arm standing rock arm 11, thisbeing swung to the right at Fig. 5 when the key 9 is de-.

pressed. To the upper end of said rock-arm 11 is connected a link 12,the other end of which is attached to an arm 13 fixed to a three-wayvalve 14:. When said key is depressed, as aforesaid, the arm 13 isthrust from the position at'Fig. 2 to that at Fig. 3, and a centralperforation or passage in said valve is opened to admit air through aninlet or pipe 16, which is connected to any source of supply 17 ofcompressed air, The air is thus admitted to a cylinder 18, in whichplays a piston 19 having a rod 20, which at Fig. 5 projects to the leftfrom said cylinder 18,- and is attached by means of a nut 21 and eye 22to a rod 23, which extends back along the cylinder 18 and is connectedto the carriage'5 of the typewriter to move the same to the leftat Fig.5,.which isa rear View; such movement to the left throwing the carriageback to the beginning of a new line. l

The rod 23 is not connected directly tothe carriage, but to theline-spacing devices so that the latter are automatically operated bythe piston 19. These connections include a rock-arm 24: extendingupwardly from a horizontal rock shaft 25, which extends from the rear tothe front of the carriage, and at its forward end carries an uprightrock-arm 26, to engage a lever 27 fulcrumed at 28 on I the carriage 5,and constituting the usual linespacing lever of said Underwoodtypewr1ting machine, said lever being adapted to drive a pawl 29 whichmeshes with a At the 11 is rocked and the valve 14 is opened, the air isadmitted to the cylinder, and the pis- Specification of Letters Patent.Patented li iar. 111, 1913.

ton is thrust back and by means of the rod 23 rocks the rock shaft 25and the arm 26,

and swings the lever 27 to turn the ratchet 30 and platen a. Pressureupon the piston 19 is sufficient not only to rock the linespace leverand turn the platen, but also to thrust the entire carriage to the leftas far as it will go at Fig. 5, so that the same is brought to positionto begin-a new line

